This is the QT5 wrapper for poppler, a PDF rendering library. It is a fork of the xpdf 3.0 PDF viewer developed by Derek Noonburg of Glyph and Cog, LLC. Poppler provides PDF rendering functionality as a shared library, to centralize the maintenence effort and to reduce duplicated effort. And the poppler developers would like to move libpoppler forward in a number of areas that doesn't fit within the goals of xpdf.